Bio:Jack Frost seemingly awoke wandering the Arctic wastes with no knowledge of his past or origins. He resembles a young man made of ice, and can create and withstand extremely cold temperatures and generate large amounts of ice. During World War II, he joined with other superheroes to form the team Liberty Legion and protect the United States from Axis homefront infiltration.

Jack Frost appeared in the modern era, where it was explained he had sacrificed himself by melding with an Arctic "ice-worm" monster in order to neutralize it and keep it from possibly devastating humanity. Jack Frost was briefly freed during an encounter with Captain America before willingly melding with the ice-worm once more. Marvel's mythological character Thor in this issue speculated that this Jack Frost may be the diminutive child of a Norse mythology Frost giant.